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Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 46,211 |  |  |  | $ 42,737 | $ 46,211 | $ 42,737 | $ 42,437 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (6,428) | (7,008) | (9,471) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 2,433 | 2,932 | 2,241 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (3,995) | (4,076) | (7,230) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 7,550 | 6,604 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  |  | (265) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  |  | 1,191 |  |  |
Provision for loan losses charged to operations | $ 1,000 | $ 2,250 | $ 1,810 | 1,750 | $ 2,150 | $ 2,150 | $ 1,750 | 1,500 | 6,810 | 7,550 | 7,530 |  |  |
Ending balance | 49,026 |  |  |  | 46,211 |  |  |  | 49,026 | 46,211 | 42,737 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | $ 1,514 | $ 2,674 | $ 4,141
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 44,960 | 41,760 | 35,776
Purchased with deteriorated credit quality | 49,026 |  |  | 46,211 | 46,211 |  |  | 42,737 | 46,211 | 42,737 | 42,437 | 49,026 | 46,211 | 42,737
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,777 |  |  |  | 2,820 | 1,777 | 2,820 |  |  |  |
Ending balance | 2,552 |  |  |  | 1,777 |  |  |  | 2,552 | 1,777 | 2,820 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 2,552 |  |  | 1,777 | 1,777 |  |  | 2,820 | 1,777 | 2,820 | 2,820 | 2,552 | 1,777 | 2,820
Commercial, financial, agricultural |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 5,542 |  |  |  | 5,486 | 5,542 | 5,486 | 4,186 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (2,415) | (2,874) | (2,725) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 618 | 422 | 331 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (1,797) | (2,452) | (2,394) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 2,508 | 3,716 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  |  | (61) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  |  | 39 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 4,524 |  | 3,694 |  |  |
Ending balance | 8,269 |  |  |  | 5,542 |  |  |  | 8,269 | 5,542 | 5,486 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 336 | 190 | 446
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 7,772 | 5,040 | 4,668
Purchased with deteriorated credit quality | 8,269 |  |  | 5,542 | 5,542 |  |  | 5,486 | 5,542 | 5,486 | 4,186 | 8,269 | 5,542 | 5,486
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 312 |  |  |  | 372 | 312 | 372 |  |  |  |
Ending balance | 161 |  |  |  | 312 |  |  |  | 161 | 312 | 372 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 161 |  |  | 312 | 312 |  |  | 372 | 312 | 372 | 372 | 161 | 312 | 372
Real estate – construction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 3,428 |  |  |  | 2,380 | 3,428 | 2,380 | 1,852 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (51) | 0 | 0 |  |  |
Recoveries |  |  |  |  |  |  |  |  | 13 | 105 | 47 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (38) | 105 | 47 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 943 | 364 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  |  | 117 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 1,365 |  | 481 |  |  |
Ending balance | 4,755 |  |  |  | 3,428 |  |  |  | 4,755 | 3,428 | 2,380 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 68 | 4 | 1
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 4,687 | 3,424 | 2,379
Purchased with deteriorated credit quality | 4,755 |  |  | 3,428 | 3,428 |  |  | 2,380 | 3,428 | 2,380 | 1,852 | 4,755 | 3,428 | 2,380
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |  |
Ending balance | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 0 |  |  | 0 | 0 |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 0
Real estate – 1-4 family mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 12,009 |  |  |  | 14,294 | 12,009 | 14,294 | 13,908 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (2,023) | (1,713) | (3,906) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 573 | 733 | 997 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (1,450) | (980) | (2,909) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | (1,305) | 2,616 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  |  | (115) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  |  | 794 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | (420) |  | 3,295 |  |  |
Ending balance | 10,139 |  |  |  | 12,009 |  |  |  | 10,139 | 12,009 | 14,294 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 79 | 606 | 1,134
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 9,572 | 10,831 | 12,319
Purchased with deteriorated credit quality | 10,139 |  |  | 12,009 | 12,009 |  |  | 14,294 | 12,009 | 14,294 | 13,908 | 10,139 | 12,009 | 14,294
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 572 |  |  |  | 841 | 572 | 841 |  |  |  |
Ending balance | 488 |  |  |  | 572 |  |  |  | 488 | 572 | 841 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 488 |  |  | 572 | 572 |  |  | 841 | 572 | 841 | 841 | 488 | 572 | 841
Real estate – commercial mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 23,384 |  |  |  | 19,059 | 23,384 | 19,059 | 21,111 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (1,197) | (1,791) | (2,123) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 1,108 | 1,565 | 757 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (89) | (226) | (1,366) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 4,551 | (879) |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  |  | (48) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  |  | 241 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 1,197 |  | (686) |  |  |
Ending balance | 24,492 |  |  |  | 23,384 |  |  |  | 24,492 | 23,384 | 19,059 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,027 | 1,867 | 2,445
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 21,564 | 20,625 | 15,008
Purchased with deteriorated credit quality | 24,492 |  |  | 23,384 | 23,384 |  |  | 19,059 | 23,384 | 19,059 | 21,111 | 24,492 | 23,384 | 19,059
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 892 |  |  |  | 1,606 | 892 | 1,606 |  |  |  |
Ending balance | 1,901 |  |  |  | 892 |  |  |  | 1,901 | 892 | 1,606 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 1,901 |  |  | 892 | 892 |  |  | 1,606 | 892 | 1,606 | 1,606 | 1,901 | 892 | 1,606
Installment and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,848 |  |  |  | 1,518 | 1,848 | 1,518 | 1,380 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (742) | (630) | (717) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 121 | 107 | 109 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (621) | (523) | (608) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 853 | 787 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  |  | (41) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 144 |  | 746 |  |  |
Ending balance | 1,371 |  |  |  | 1,848 |  |  |  | 1,371 | 1,848 | 1,518 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 4 | 7 | 115
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,365 | 1,840 | 1,402
Purchased with deteriorated credit quality | 1,371 |  |  | 1,848 | 1,848 |  |  | 1,518 | 1,848 | 1,518 | 1,380 | 1,371 | 1,848 | 1,518
Installment and Other | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1 |  |  |  | 1 | 1 | 1 |  |  |  |
Ending balance | 2 |  |  |  | 1 |  |  |  | 2 | 1 | 1 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | $ 2 |  |  | $ 1 | $ 1 |  |  | $ 1 | $ 1 | $ 1 | $ 1 | $ 2 | $ 1 | $ 1

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